package com.fsck.k9.ui.settings.account

import android.app.Dialog
import android.os.Build
import android.os.Bundle
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.CheckedTextView
import android.widget.SeekBar
import android.widget.SeekBar.OnSeekBarChangeListener
import android.widget.TextView
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.widget.SwitchCompat
import androidx.preference.PreferenceDialogFragmentCompat
import com.fsck.k9.NotificationVibration
import com.fsck.k9.VibratePattern
import com.fsck.k9.ui.R
import com.fsck.k9.ui.getEnum
import com.fsck.k9.ui.putEnum
import org.koin.android.ext.android.inject

class VibrationDialogFragment : PreferenceDialogFragmentCompat() {
    private val vibrator: Vibrator by inject()

    private val vibrationPreference: VibrationPreference
        get() = preference as VibrationPreference

    private lateinit var adapter: VibrationPatternAdapter

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val context = requireContext()

        val isVibrationEnabled: Boolean
        val vibratePattern: VibratePattern
        val vibrationTimes: Int
        if (savedInstanceState != null) {
            isVibrationEnabled = savedInstanceState.getBoolean(STATE_VIBRATE)
            vibratePattern = savedInstanceState.getEnum(STATE_VIBRATE_PATTERN)
            vibrationTimes = savedInstanceState.getInt(STATE_VIBRATION_TIMES)
        } else {
            isVibrationEnabled = vibrationPreference.isVibrationEnabled
            vibratePattern = vibrationPreference.vibratePattern
            vibrationTimes = vibrationPreference.vibrationTimes
        }

        adapter = VibrationPatternAdapter(
            isVibrationEnabled,
            entries = vibrationPreference.entries.map { it.toString() },
            entryValues = vibrationPreference.entryValues.map { it.toString().toInt() },
            vibratePattern,
            vibrationTimes,
        )

        return AlertDialog.Builder(context)
            .setAdapter(adapter, null)
            .setPositiveButton(R.string.okay_action, ::onClick)
            .setNegativeButton(R.string.cancel_action, ::onClick)
            .create()
    }

    override fun onDialogClosed(positiveResult: Boolean) {
        if (positiveResult) {
            vibrationPreference.setVibration(
                isVibrationEnabled = adapter.isVibrationEnabled,
                vibratePattern = adapter.vibratePattern,
                vibrationTimes = adapter.vibrationTimes,
            )
        }
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        outState.putBoolean(STATE_VIBRATE, adapter.isVibrationEnabled)
        outState.putEnum(STATE_VIBRATE_PATTERN, adapter.vibratePattern)
        outState.putInt(STATE_VIBRATION_TIMES, adapter.vibrationTimes)
    }

    private fun playVibration() {
        val vibratePattern = adapter.vibratePattern
        val vibrationTimes = adapter.vibrationTimes
        val vibrationPattern = NotificationVibration.getSystemPattern(vibratePattern, vibrationTimes)

        vibrator.vibrate(vibrationPattern)
    }

    private inner class VibrationPatternAdapter(
        var isVibrationEnabled: Boolean,
        private val entries: List<String>,
        private val entryValues: List<Int>,
        initialVibratePattern: VibratePattern,
        initialVibrationTimes: Int,
    ) : BaseAdapter() {
        private var checkedEntryIndex = entryValues.indexOf(initialVibratePattern.serialize()).takeIf { it != -1 } ?: 0

        val vibratePattern: VibratePattern
            get() = VibratePattern.deserialize(entryValues[checkedEntryIndex])

        var vibrationTimes = initialVibrationTimes

        override fun hasStableIds(): Boolean = true

        override fun getItemId(position: Int): Long = position.toLong()

        override fun getItemViewType(position: Int): Int {
            return when {
                position == 0 -> 0
                position.toEntryIndex() < entries.size -> 1
                else -> 2
            }
        }

        override fun getViewTypeCount(): Int = 3

        override fun getCount(): Int = entries.size + 2

        override fun getItem(position: Int): Any? {
            return when {
                position == 0 -> null
                position.toEntryIndex() < entries.size -> entries[position.toEntryIndex()]
                else -> null
            }
        }

        private fun Int.toEntryIndex() = this - 1

        override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
            return when (getItemViewType(position)) {
                0 -> getVibrationSwitchView(convertView, parent)
                1 -> getVibrationPatternView(position, convertView, parent)
                2 -> getVibrationTimesView(convertView, parent)
                else -> error("Unknown item type")
            }
        }

        private fun getVibrationSwitchView(convertView: View?, parent: ViewGroup?): View {
            return convertView.orInflate<View>(R.layout.preference_vibration_switch_item, parent)
                .apply {
                    val switchButton = findViewById<SwitchCompat>(R.id.vibrationSwitch)
                    switchButton.isChecked = isVibrationEnabled
                    switchButton.setOnCheckedChangeListener { _, isChecked ->
                        isVibrationEnabled = isChecked
                        notifyDataSetChanged()
                    }

                    findViewById<View>(R.id.switchContainer).setOnClickListener {
                        switchButton.toggle()
                    }
                }
        }

        private fun getVibrationPatternView(position: Int, convertView: View?, parent: ViewGroup?): View {
            return convertView.orInflate<CheckedTextView>(R.layout.preference_vibration_pattern_item, parent)
                .apply {
                    text = getItem(position) as String
                    val entryIndex = position.toEntryIndex()
                    isChecked = entryIndex == checkedEntryIndex
                    isEnabled = isVibrationEnabled
                    setOnClickListener {
                        checkedEntryIndex = entryIndex
                        playVibration()
                        notifyDataSetChanged()
                    }
                }
        }

        private fun getVibrationTimesView(convertView: View?, parent: ViewGroup?): View {
            return convertView.orInflate<View>(R.layout.preference_vibration_times_item, parent).apply {
                val vibrationTimesValue = findViewById<TextView>(R.id.vibrationTimesValue)
                vibrationTimesValue.text = vibrationTimes.toString()

                val vibrationTimesSeekBar = findViewById<SeekBar>(R.id.vibrationTimesSeekBar).apply {
                    isEnabled = isVibrationEnabled
                }

                val progress = vibrationTimes - 1
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    vibrationTimesSeekBar.setProgress(progress, false)
                } else {
                    vibrationTimesSeekBar.progress = progress
                }

                vibrationTimesSeekBar.setOnSeekBarChangeListener(
                    object : OnSeekBarChangeListener {
                        override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
                            vibrationTimes = progress + 1
                            vibrationTimesValue.text = vibrationTimes.toString()
                        }

                        override fun onStartTrackingTouch(seekBar: SeekBar) = Unit

                        override fun onStopTrackingTouch(seekBar: SeekBar) {
                            playVibration()
                        }
                    },
                )
            }
        }

        @Suppress("UNCHECKED_CAST")
        private fun <T : View> View?.orInflate(layoutResId: Int, parent: ViewGroup?): T {
            val view = this ?: layoutInflater.inflate(layoutResId, parent, false)
            return view as T
        }
    }

    companion object {
        private const val STATE_VIBRATE = "vibrate"
        private const val STATE_VIBRATE_PATTERN = "vibratePattern"
        private const val STATE_VIBRATION_TIMES = "vibrationTimes"
    }
}
